Rear bumper for an automobile



FIG. 1 is a perspective view of a rear bumper for an automobile showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The claimed design is indicated by the relatively dark portions in the figures. The relatively light portions form no part of the claimed design. 

CLAIM The ornamental design for a rear bumper for an automobile, as shown and described. 